[all variants] Building Cybercafe - HELP

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Hello...
i need help at building Cybercafe "GAMING".
i have heard about the technique "Diskless".
from this link
Cafeshttp://kualalumpurcity.olx.com.my/di...s-iid-66238262
Server under Linux OS
100x Client under MS Windows Xp\7 , 32bit\64bit
is diskless better than normal HDD ?
how to build it?
What is the Recommended Server Specifications?
(Hardware)

I have an Cisco router with an DHCP server.
Within the DHCP config I set the TFTP server to an vmware vsphere server.
On the server (on an Ubuntu virtual machine) inside the map where my TFTP server is pointing to I put the file from here http://cdimage.ubuntu.com/netboot/ (14.04 "netboot.tar.gz").